JavaScript | Merge Two Sorted Linked List

Merge Two Linked List


  • We create an auxiliary array of size m+n
  • While traversing through both the arrays: Pick the smaller of current elements of arr1 and arr2, save the smaller value of both the arrays in the auxiliary array, thereby increment the positions accordingly.
  • Now copy the auxiliary array to arr1 as the final array should be arr1
// Definition for singly-linked list.
function Node(val) {
this.val = val; = null;

* @param {Node} list1
* @param {Node} list2
* @return {Node}
var mergeTwoLists = function(list1, list2) {
let finalList = new Node();
let head = finalList;

while (list1 !== null && list2 !== null) {

// Select the smallest value from either linked list,
// then increment that list forward.

if (list1.val < list2.val) { = new Node(list1.val)
list1 =
} else { = new Node(list2.val)
list2 =

finalList =

// It's possible that one linked list is shorter than the other, so we can just add the remainder of the last linked list.

if (list1 !== null) = list1
if (list2 !== null) = list2

// return .next because this first element in the linkedlist is empty




Working in Walmart as UI Developer | Mentor | React | JavaScript | HTML | CSS

Love podcasts or audiobooks? Learn on the go with our new app.

Recommended from Medium

The status of JavaScript libraries & frameworks: 2018 & beyond.

How to Drive a Cross Platform React project

How to create “Todo List” Telegram bot with React.js

Angular Basics: Read Data From External File On Your Prod Build

Best way to customize user verification in laravel

The Power of Higher Order Array Functions

The power of higher order array functions

Why we use Vue.js

Tensorflow.js NLP QNA Model with Vue 3

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store
iAmSonika |

iAmSonika |

Working in Walmart as UI Developer | Mentor | React | JavaScript | HTML | CSS

More from Medium

JavaScript Algorithms: Maximum Subarray(LeetCode)

Object Oriented JavaScript

What is Hoisting in JavaScript?

Hoisting in JavaScript A-Z